<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html"; charset="utf-8">
<title>login </title>
</head>
<body>


<form action="http://127.0.0.1/index.php?a=login&b=index" method="POST">
    用户名</br>
    <input name='username' value=''>
    </br>密码</br>
    <input name='password' value='' type='password'>
    <p></p>
    <input value='login' type='submit'>
</form>

</body>
</html>